Report by the Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB) on Topical Peer Review Ageing Management of Nuclear Power Plants and Research Reactors Publisher: Federal Ministry for the Environment, Nature Conservation, Building and Nuclear Safety (BMUB) Division RS I 5 · PO box 12 06 29 · 53048 Bonn · Germany E-Mail: [email protected] Website: http://www.bmub.bund.de Editors: Division RS I 5 (General and Fundamental Aspects of Reactor Safety, Nuclear Safety Codes and Standards, Multilateral Regulatory Cooperation) Date: 28th December 2017 Contents Contents List of Figures ............................................................................................................................... V List of Tables ................................................................................................................................ VI Abbreviations .............................................................................................................................. VII Executive Summary ...................................................................................................................... 1 Preamble ..................................................................................................................................... 2 1 General information ................................................................................................... 3 1.1 Nuclear installations identification ................................................................................. 3 1.2 Process to develop the national assessment report ...................................................... 7 2 Overall ageing management programme requirements and their implementation ........................................................................................................... 8 2.1 German national regulatory framework ......................................................................... 8 2.2 International standards ............................................................................................... 12 2.3 Description of the overall ageing management programme ........................................ 12 2.3.1 Scope of the overall AMP ........................................................................ 12 2.3.1.a Nuclear power plants ............................................................................... 12 2.3.1.b Research reactors ................................................................................... 14 2.3.2 Ageing assessment ................................................................................. 15 2.3.2.a Nuclear power plants ............................................................................... 15 2.3.2.b Research reactors ................................................................................... 17 2.3.3 Monitoring, testing, sampling and inspection activities ............................. 18 2.3.3.a Nuclear power plants ............................................................................... 18 2.3.3.b Research reactors ................................................................................... 20 2.3.4 Preventive and remedial actions .............................................................. 20 2.3.4.a Nuclear power plants ............................................................................... 20 2.3.4.b Research reactors ................................................................................... 21 2.4 Review and update of the overall AMP ....................................................................... 22 2.4.a Nuclear power plants ............................................................................... 22 2.4.b Research reactors ................................................................................... 23 2.5 Licensee’s experience of application of the overall AMP ............................................ 24 2.5.a Nuclear power plants ............................................................................... 24 2.5.b Research reactors ................................................................................... 25 2.6 Regulatory oversight process ..................................................................................... 25 2.7 Regulator’s assessment of the overall ageing management programme and conclusions ................................................................................................................ 29 Contents 2.7.a Nuclear power plants ............................................................................... 29 2.7.b Research reactors ................................................................................... 31 3 Electrical cables ....................................................................................................... 32 3.1 Description of ageing management programmes for electrical cables ........................ 32 3.1.1 Scope of ageing management for electrical cables .................................. 32 3.1.1.a Nuclear power plants ............................................................................... 32 3.1.1.b Research reactors ................................................................................... 33 3.1.2 Ageing assessment of electrical cables ................................................... 34 3.1.2.a Nuclear power plants ............................................................................... 34 3.1.2.b Research reactors ................................................................................... 38 3.1.3 Monitoring, testing, sampling and inspection activities for electrical cables ....................................................................................... 39 3.1.3.a Nuclear power plants ............................................................................... 39 3.1.3.b Research reactors ................................................................................... 40 3.1.4 Preventive and remedial actions for electrical cables ............................... 41 3.1.4.a Nuclear power plants ............................................................................... 41 3.1.4.b Research reactors ................................................................................... 42 3.2 Licensee’s experience of the application of AMPs for electrical cables ....................... 42 3.2.a Nuclear power plants ............................................................................... 42 3.2.b Research reactors ................................................................................... 43 3.3 Regulator’s assessment and conclusions on ageing management of electrical cables ......................................................................................................................... 43 3.3.a Nuclear power plants ............................................................................... 43 3.3.b Research reactors ................................................................................... 46 4 Concealed pipework ................................................................................................ 47 4.1 Description of ageing management programmes for concealed pipework .................. 47 4.1.1 Scope of ageing management for concealed pipework ............................ 47 4.1.1.a Nuclear power plants ............................................................................... 47 4.1.1.b Research reactors ................................................................................... 48 4.1.2 Ageing assessment of concealed pipework ............................................. 49 4.1.2.a Nuclear power plants ............................................................................... 49 4.1.2.b Research reactors ................................................................................... 53 4.1.3 Monitoring, testing, sampling and inspection activities for concealed pipework ................................................................................. 54 4.1.3.a Nuclear power plants ............................................................................... 54 4.1.3.b Research reactors ................................................................................... 57 4.1.4 Preventive and remedial actions for concealed pipework ......................... 58 4.1.4.a Nuclear power plants ............................................................................... 58 Contents 4.1.4.b Research reactors ................................................................................... 58 4.2 Licensee’s experience of the application of AMPs for concealed pipework ................. 59 4.2.a Nuclear power plants ............................................................................... 59 4.2.b Research reactors ................................................................................... 60 4.3 Regulator’s assessment and conclusions on ageing management of concealed pipework ..................................................................................................................... 60 4.3.a Nuclear Power plants ............................................................................... 60 4.3.b Research reactors ................................................................................... 62 5 Reactor pressure vessels ........................................................................................ 63 5.1 Description of ageing management programmes for RPVs .......................................